The Diocese takes its beginnings from the enthronement of its first Bishop on the 4th July 1910 - four years after the Northern Diocese Statute was passed by the Diocese of Perth. It was , however, not until December 1961 that, by an Act of Parliament, The Diocese of North West Australia was able to call its first Synod. This Diocese is one of the three dioceses of the province of Western Australia (constituted in 1914) and is one of the constituent dioceses of the Anglican Church in Australia. It covers more than 1.3 million square kilometres (which makes it the largest diocese in the Anglican Communion in terms of land area.
The Coat of Arms has been in use since the early history of the Diocese, but it was not until the 5th December 1956 that the Diocese received a grant of arms.
A gold cross divides four sections, which contain the four stars of the Southern Cross, A mother of pearl shell a spear and a boomerang, and a black swan.
These represent, in order, the nation of Australia, the pearling industry of the original See town of Broome, the Aborigines of the North West, and the State of Western Australia signified by the Black Swan.
Bishops of North West Australia
 Bishop Gerard Trower |
 Bishop John Frewer |
 Bishop Howell Arthur John Witt |
 Bishop Gerald Bruce Muston |
 Bishop Anthony Howard Nichols |
 Bishop David Gray Mulready |